Influence of spring and autumn phenological transitions on forest ecosystem productivity
Andrew D. Richardson,T. Andy Black,Philippe Ciais,Nicolas Delbart,Mark A. Friedl,Nadine Gobron,David Y. Hollinger,Werner L. Kutsch,Bernard Longdoz,Sebastiaan Luyssaert,Sebastiaan Luyssaert,Mirco Migliavacca,Leonardo Montagnani,Leonardo Montagnani,J. William Munger,Eddy Moors,Shilong Piao,Corinna Rebmann,Markus Reichstein,Nobuko Saigusa,Enrico Tomelleri,Rodrigo Vargas,Andrej Varlagin +22 more
TLDR
Investigation of relationships between phenology and productivity in temperate and boreal forests finds the productivity of evergreen needleleaf forests is less sensitive to phenology than is productivity of deciduous broadleaf forests, which has implications for how climate change may drive shifts in competition within mixed-species stands.Abstract:
We use eddy covariance measurements of net ecosystem productivity (NEP) from 21 FLUXNET sites (153 site-years of data) to investigate relationships between phenology and productivity (in terms of both NEP and gross ecosystem photosynthesis, GEP) in temperate and boreal forests. Results are used to evaluate the plausibility of four different conceptual models. Phenological indicators were derived from the eddy covariance time series, and from remote sensing and models. We examine spatial patterns (across sites) and temporal patterns (across years); an important conclusion is that it is likely that neither of these accurately represents how productivity will respond to future phenological shifts resulting from ongoing climate change. In spring and autumn, increased GEP resulting from an 'extra' day tends to be offset by concurrent, but smaller, increases in ecosystem respiration, and thus the effect on NEP is still positive. Spring productivity anomalies appear to have carry-over effects that translate to productivity anomalies in the following autumn, but it is not clear that these result directly from phenological anomalies. Finally, the productivity of evergreen needleleaf forests is less sensitive to phenology than is productivity of deciduous broadleaf forests. This has implications for how climate change may drive shifts in competition within mixed-species stands.read more
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PART OF A SPECIAL ISSUE ON PLANTS AND CLIMATE CHANGE Changes in autumn senescence in northern hemisphere deciduous trees: a meta-analysis of autumn phenology studies
Allison L. Gill,Amanda S. Gallinat,Rebecca Sanders-DeMott,Angela J. Rigden,Daniel J. Short Gianotti,J. Mantooth,Pamela H. Templer +6 more
TL;DR: In this paper, a meta-analysis was conducted of published studies from the peer-reviewed literature that reported autumn senescence dates for deciduous trees in the northern hemisphere, encompassing 64 publications with observations ranging from 1931 to 2010.
Journal ArticleDOI
Day length unlikely to constrain climate-driven shifts in leaf-out times of northern woody plants
TL;DR: Assessment of the importance of photoperiod as a leaf-out regulator in 173 woody species from throughout the Northern Hemisphere and the influence of winter duration, temperature seasonality, and inter-annual temperature variability combines results from climate- and light-controlled chambers with species’ native climate niches inferred from georeferenced occurrences and range maps.
Tracking vegetation phenology across diverse North American biomes using PhenoCam imagery: A new, publicly-available dataset
TL;DR: In this article, the authors presented a series of datasets, together consisting of almost 750 years of observations, characterizing vegetation phenology in diverse ecosystems across North America, derived from conventional, visible-wavelength, automated digital camera imagery collected through the PhenoCam network, with RGB (red, green, blue) colour channel information, with means and other statistics calculated across a region-of-interest (ROI) delineating a specific vegetation type.
Journal ArticleDOI
Weakening temperature control on the interannual variations of spring carbon uptake across northern lands
Shilong Piao,Shilong Piao,Zhuo Liu,Tao Wang,Shushi Peng,Philippe Ciais,Mengtian Huang,Anders Ahlström,John F. Burkhart,Frédéric Chevallier,Ivan A. Janssens,Su-Jong Jeong,Xin Lin,Jiafu Mao,John B. Miller,John B. Miller,Anwar Mohammat,Ranga B. Myneni,Josep Peñuelas,Xiaoying Shi,Andreas Stohl,Yitong Yao,Zaichun Zhu,Pieter P. Tans +23 more
TL;DR: In this article, the authors used 34 years of atmospheric CO2 concentration measurements at Barrow, Alaska (BRW, 71°N) to show that the interannual relationship between spring temperature and carbon uptake has recently shifted.
Journal ArticleDOI
Contrasting trait syndromes in angiosperms and conifers are associated with different responses of tree growth to temperature on a large scale.
TL;DR: The empirical relationships between the responses of tree growth to temperature and hydraulic safety margins in angiosperm and coniferous trees are examined and suggest a future scenario in Mediterranean forests characterized by contrasting demographic responses in conifer andAngiosperm trees to both temperature and forest succession, with increased dominance of angiosperms and conifers, and particularly negative impacts in pines.
References
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Shifting plant phenology in response to global change
TL;DR: Recent advances in several fields that have enabled scaling between species responses to recent climatic changes and shifts in ecosystem productivity are discussed, with implications for global carbon cycling.
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